[5.04] Multiwavelength Observations of a Few Unidentified EGRET Sources

More than sixty percent of the high energy gamma-ray sources
detected by EGRET are unidentified, with no firmly
established counterparts at other wavebands. The nature of
these sources have remained a mystery in high energy
astrophysics since the first surveys of the gamma-ray sky
with the COS-B satellite. Some of the unidentified EGRET
sources have large error circles, and a multiwavelength
approach is often needed to understand the nature of these
sources. Here we present results from the analysis of
archival ROSAT and ASCA X-ray data of the COS-B field 2CG
075+00 in the Galactic plane, which overlaps with two EGRET
sources 3EG 2016+3657 and 3EG 2021+3716. The most likely
candidate for 3EG 2016+3657 is the blazar-like radio source
G74.87+1.22 (B2013+370). Optical observations with the MDM
2.4m and KPNO 2.1m telescopes, as well as archival radio
data are also presented to support the identification. In
addition, work in progress on two other unidentified EGRET
sources are also described.